Fe(acac)_3/吡啶二亚胺/Al(i-Bu)_3三元催化体系催化乙烯聚合

Fe(acac)_3/bis(imino)pyridine/Al(i-Bu)_3 ternary catalytic system for ethylene polymerization

报道了采用乙酰丙酮铁[Fe（acac）3,（acac为乙酰丙酮基）]/吡啶二亚胺/Al（i-Bu）3新型催化体系,在甲苯中催化乙烯聚合.考察了催化剂组成、聚合条件、加料方式及不同吡啶二亚胺化合物对Fe（acac）3/吡啶二亚胺/Al（i-Bu）3体系催化乙烯聚合的影响.结果表明,Fe（acac）3/吡啶二亚胺/Al（i-Bu）3催化体系能高活性（2.20×10^6g/（mol.h））催化乙烯聚合,得到高相对分子质量（Mw=35.3×10^4）聚乙烯,相对分子质量分布在3.05-4.26,呈单峰分布.所得聚合物具有较高的熔点（130.2-134.1℃）,为线性聚乙烯.

Fe（acac）3/bis（imino）pyridine/Al（i-Bu）3 catalytic systems were reported for the polymerization of ethylene in toluene. The influence of catalyst compositions, polymerization conditions （such as Al/Fe molar ratio and polymerization temperature）, catalyst preparation methods and different bis（imino）pyridine compounds on ethylene polymerization were investigated. The results revealed that the catalytic system exhibited high catalytic activity （2.20×10^6g/（mol · h）） and produced polyethylene （PE） with high molecular weight （Mw =35.3 × 10^4 ）. The molecular weight distribution of PE was relatively narrow and it was in the range of 3.05-4. 26. The polymer obtained was linear PE with high melting temperature （130. 2-134. 1℃）.